They use UK sizing and are imported. Comfy, good value, and actually really cute! The flowers are so pretty and they are so comfortable. If you want an "objet dart" that also plays music, this just might be your jam. This is my 3rd pair of Romeos. They fit in my ear as well as airpods, which is not at all, so there?s nothing but external noise. A few years ago I bought a pair of mid-priced UE earbuds and was blown away by the sound quality. It ran out of battery in about 30 minutes while other stick still has battery. But these are very comfortable. NFC instant connectivity is awesome.